Machine-clamp



H. CADWALLADER, Jn. MACHINE CLAMP.

APPLICATION FILED MAR. 13, I919.

1,37,02W, Patented'Apr. 26,,1921.

, i'lE SAYS FEQE.

MACHINE-CLAIEP.

Specification of Letters Patent.

Patented Apr. 26, 1921.

Application filed March 13, 1919. Serial No. 282,453.

To all whom it may concern:

Be it known that I, HARRY GA WALLADER, Jr., a citizen of the United States, and a resident of Philadelphia, county of Philadelphia, State of Pennsylvania, have in vented certain new and useful Improvements in Machine-Clamps, of which the following is a specification. I

Some of the objects of the present invention are to provide a clamp for machine shop practice to hold a piece of work in fixed position upon a planer, a lathe, drill press, milling and boring machines and other suitable supports; to provide a clamp whereby machine work can be set up in a minimum time; to provide a clamp arranged to direct the applied force substantially perpendicular to the face of the work engaged by the clamp; to provide a clamp arranged to co-act with work material which is not provided with lugs or flanges capable of being engaged by a clamp; and to provide other improvements as will hereinafter appear.

In the accompanying drawings Figurel represents a side elevation of an end clamp embodying one form of the present invention; Fig. 2 represents a bottom plan of the same; Fig. 3 represents a side elevation of a modified form of the invention; Fig. 4 represents a bottom plan of the same; Fig. 5 represents a side elevation of another form of the invention; Fig. 6 represents a bottom plan of the same; and Figs. 7 8 and 9 represent respectively operative positions of the several clamps.

Referring to the drawings one form of the present invention consists, as shown in Figs. 1 and 2, of a body 10 formed of suitable material designed towithstand bending, shearing or other stresses and strains and generally of a character to stand up under the rough use of a machine shop.

For the purpose of distributing the various strains to which the clamp is subjected in use, and giving essential strength with a minimum of material, the body 10 is provided with a base 11 of substantially uniform thickness, two opposite side edges of which are formed with substantially perpendicular flanges 12 to give depth of body where needed to prevent bending orshearing. The outer edges of these flanges 12 are rearwardly tapered as indicated at 13 and merge into side extensions 14 of a'rear wall 15, these latter members providing a plane surface 16 at the rear of the body 10 which forms a substantial seat to support that end of the clamp upon a table, block or any suitable support.

For clamping the piece, part or any work to be held securely to the machinetable,

the body 10 is provided with a laterally disposed aw 20 formed substantially as a continuation of the base 11, the top surface of the aw 20 being, preferably, beveled to form a relatively thin gripp g g adapt ed to seat in slots or openings of small dimensions with which the work may be provided. slot 21 is formed through the base 11 1n axial coincidence with the long axis of the body 10, this slot being relatively long and of a width to receive the shank of a bolt 22 by means of which the body. 10 is made fast to the supporting table to hold the work in fixed position. By

thus providing a slot lengthwise of the body 10 and of considerable length, free adjustment of the clamping bolt 22 can be had and the work may if desired'be removed without entirely from the body 10.

As a means to grip the work, and also to prevent movement of the work during the clamp ng action, the aw 20 is provided with a promotion 23, preferably extending transversely of the j aw and presenting'a rounded bearing surface for contact with the work face upon which it is to seat. This feature of the clamp is an important one in that it directs the applied force substantially perpendicularly to the work surface whatever the angular position of the clamp body relative to the work. Where a plane clamping face is employed and the clamp is below and angularly positibned with respect to the work, the applied force acts at such an angle as to push or force the work away from the clamp so that in operation the part held works loose and the entire set-up has to be done over. With the rounded or beaded lip formation on the jaw this difiiculty is overcome and the work is clamped fast under all normal angular positions of the clamp.

In Figs. 3 and 4 another form of the invention is shown wherein the clamp body 10 is of the double end type, each end being similar in construction to the aw 20 shown in Fig. 1. The body in this modified form is provided with two opposite, parallel, side flanges 24 for strengthening purposes and between which a slot 25 of elongated con disconnecting the bolt 22 particularly, in the clamping of work which does not have lugs, flanges or other projecting parts readily engageable by a clamp of V the single or double end type. In this form the legs 30 are respectively provided with rounded projections 31 on the jaws 32, while the body 33 of the clamp has a lug or stem 34 arranged to serve as a support for one end of the clamp The legs 30 are spaced sufficiently to provide a recess 35 to receive the shank of the clamping bolt 22 and to permit proper adjustment as will be under stood. Where the work to be clamped has no projecting ledges, lugs or flanges adapted to form a seat for one end of a clamp, a small hole can be drilled at a convenient point in the side of the work and the stem 34: inserted, after which, the free ends being suitably supported upon blocks, the clamp may be tightened and the work thus firmly held.

In Figs. 7, 8 and 9 the several forms of the clamps forming the present invention are shown in operative position engaging, hold ing and clamping a part to be machined in fixed position upon a machine table. The entire arrangement is simple and effective, the clamps are readily applied to any class of-work and can be adjusted to any height or position by using the ordinary packing in the same direction as said rounded projection, said flanges having a depth greater than the thickness or" said jaw and respectively merging into one face of said jaw, and means between said flanges and traversing said slot for clamping said body and jaw to hold said work.

2. In a clamp for machine work, a body part having a longitudinally disposed slot therein, jaws formed respectively on the ends of said body part and extending in opposite directions laterally therefrom, a rounded projection formed on one side of each jaw to contact with work to be clamped, said projections projecting in the same direction, a pair of flanges formed respectively at opposite edges of said body part and ex tending in the same direction as said pro-v j ections, said flanges having a depth greater than the thickness or" the respective jaws, and means between said flanges and traversing said slot for clamping said body and jaws to hold said work.

Signed at Philadelphia, in the county of Philadelphia, and State of Pennsylvania, this 10th day of March A. D. 1919. i

HARRY CADWALLADER, JR. 

